From patchwork Tue Sep 1 15:08:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 264545 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EC4C2C433E2 for ; Tue, 1 Sep 2020 16:43:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2ACE2067C for ; Tue, 1 Sep 2020 16:43:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598978618; bh=qEUBPgWgjWF0Gc0SRUEsBtJRhQzYGp9MrUrb9t2w3r0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DMkNBF0sF1qbyInN5NEy56BsVWH3uCCWngp0PHozP1DlYw2ADqnfJ9NXzz+v2yiKG teCDlr3Z+oCBButm429YLgcMsxJFg2v7//lIV4FCi9JDfi2w8DkFhPfRN2Bly9Rgga AfgtmgCq/c8UtlGwBtm2+Zc9SYgnk1+8B4aKnYOU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730012AbgIAQnb (ORCPT ); Tue, 1 Sep 2020 12:43:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:55268 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729171AbgIAP1t (ORCPT ); Tue, 1 Sep 2020 11:27:49 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A6FAE2100A; Tue, 1 Sep 2020 15:27:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598974068; bh=qEUBPgWgjWF0Gc0SRUEsBtJRhQzYGp9MrUrb9t2w3r0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RiMnkPj6W9gYVi5Nic5gjTNsTWb57pSNskJQBe48VmjHf9SPc/e9QzBlDvhZCHwMh m5Z0BI2WsmojXgPY3/fNTs2KZpImoOCVD/PQ/g7Nt1hev8k1f+ksRGcBF1CGn/wgt/ UtlYih1v6KarHFlKRjQTp/r2/KqN7HGVxLVlLptQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Peilin Ye , Ursula Braun , "David S. Miller" Subject: [PATCH 5.4 008/214] net/smc: Prevent kernel-infoleak in __smc_diag_dump() Date: Tue, 1 Sep 2020 17:08:08 +0200 Message-Id: <20200901150953.358592363@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150952.963606936@linuxfoundation.org> References: <20200901150952.963606936@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Peilin Ye [ Upstream commit ce51f63e63c52a4e1eee4dd040fb0ba0af3b43ab ] __smc_diag_dump() is potentially copying uninitialized kernel stack memory into socket buffers, since the compiler may leave a 4-byte hole near the beginning of `struct smcd_diag_dmbinfo`. Fix it by initializing `dinfo` with memset(). Fixes: 4b1b7d3b30a6 ("net/smc: add SMC-D diag support") Suggested-by: Dan Carpenter Signed-off-by: Peilin Ye Signed-off-by: Ursula Braun Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/smc/smc_diag.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) --- a/net/smc/smc_diag.c +++ b/net/smc/smc_diag.c @@ -170,13 +170,15 @@ static int __smc_diag_dump(struct sock * (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) && !list_empty(&smc->conn.lgr->list)) { struct smc_connection *conn = &smc->conn; - struct smcd_diag_dmbinfo dinfo = { - .linkid = *((u32 *)conn->lgr->id), - .peer_gid = conn->lgr->peer_gid, - .my_gid = conn->lgr->smcd->local_gid, - .token = conn->rmb_desc->token, - .peer_token = conn->peer_token - }; + struct smcd_diag_dmbinfo dinfo; + + memset(&dinfo, 0, sizeof(dinfo)); + + dinfo.linkid = *((u32 *)conn->lgr->id); + dinfo.peer_gid = conn->lgr->peer_gid; + dinfo.my_gid = conn->lgr->smcd->local_gid; + dinfo.token = conn->rmb_desc->token; + dinfo.peer_token = conn->peer_token; if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0) goto errout;